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(No Model.) 2 Sheets-Sheet; 1.

' B. F. BERGH.

ROCK DRILLING MACHINE.

. Pate'n'pedJune 14, 1887 jiwezz'ar hiiizeases N. PETERS. Plv: ahllmgnpher, Wnhin mn, D. c.

2 H G R B B R B ROCK DRILLING MAGHINE.

Patented June 14,1887.

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--. PETERS, Pholo-Lllhographer, w-nm mn. n1;

UNITED STATES BBOB F. BERGH, OF NE\V YORK, N. Y.,

PATENT OFFICE.

ASSIGNOR, BY MESNE ASSIGNMENTS,

TO THE STANDARD HAND ROCK DRILL COMPANY, OF SAME PLACE.

ROCK-DRILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 364,702, dated June l4, 1887.

Application filed February 6, 1885. Serial No. 155,657. (No model.)

To all whom it may concern:

Be it known that I, BROR F. BERGH, of New York city, in the county and State of New York, have invented a new and useful Improvement in Rock Drilling Machines, of which the following is a specification.

In Letters Patent numbered 808,947, dated December 9, 1884, I described a rock-drill machine. The apparatus which I am about to describe as the subject of my invention is designed as an improvement upon the apparatus described in said Letters Patent for operating the hammer. The apparatus described herein for operating the hammer may be used in connection with the contrivances described in said patent for operating the drill and the feed, or with the contrivances for the same purpose described in another application filed herewith, or with any other contrivances suitable for the performance of those functions.

Figure 1 is a side view of a drill-machine containing my invention, with the side pieces of the supporting-frame brgken away. Fig.

2 is a top view of the same with the hammerhead and a portion of the liaminer'helve removed. Fig. 3 is asection through the line 3 3, Fig. 1. Fig. 4 is a detail view showing the relative arrangement of the parts adjacent to the end of the hammer-arm; and Fig. 5 shows the drill-holder and surrounding parts in section through the line 5 5, Fig. 1'.

A is the sliding frame of the machine, upon which the operating parts are mounted.

B is the main shaft, upon which the handlevers are mounted. This shaft is composed of two parts, which abut together at the center, and are doweled at I), to prevent one re- 1 volv1ng on the other.

A hole is bored completely through the center of this shaft,w'hich hole is tapered, gradually enlarging from near its center to each end.

0 are the hand-lever sockets, which are conical, so as to fit into the conical hole at each end of the main shaft. These hand-lever sockets are also hollow, and D is a bolt, which passes longitudinally through the two handlever sockets and through the main shaft B, as shown. Upon one end of this bolt is a handnut, d, and the hand-levers may be adjusted, by tightening and loosening this nut, in any position most convenient for the operator. The conical friction-surfaces between the shaft B and the sockets 0 hold the levers'seeurely in position. The tightening of this nut also serves to secure the two halves of the main 5 shaft B together. On each half of the main shaft B is cast a rocker-arm, c c, and a pin extends from one of these rocker-arms to the other. Upon this pin are strung anumber of levers and pawls, f f g g h 71.. f f are the levers by which the drill is reciprocated, and which have been fully described in the patent already referred to. g g bear the pawls for rotating the drill. h h are pawls whereby motion is communicated to the ham meroperating 6 5 mechanism.

The sliding frame is made of two side plates, a a, connected at front by the barrel for the drill-holder and at the rear and bottom by the plate a, which is provided with a suitable opening, as shown, for the spring it. These parts are cast in one piece, and constitute a box or inclosure, open at the top for the operating mechanism.

iis a shaft journaled in the side plates of the sliding frame. Uponthis shaft, between the two side plates of the sliding frame, are mounted two wheels, each of the form shown at j, which are connected by a hub, 7c, and the pinsZZZZZl. from each other sufliciently for the pawls h h to operate between them on the pins Z in the position shown in- Fig. 4.

h is a pushing-pawl, and his a pulling-pawl,

so that the wheels j are rotated the distance between two pins Z each time that the hand levers are reciprocated forward or back. The pawls h h are held against the pins 1 by the spiral spring m between them. Upon each of the wheels j there is a' rounded tooth, n, for

every one of the pins Z. 0 is a forked pawl, which is pivoted to the hammer-arm at p, and straddles the pawl h, so as to engage on' either side with the rounded teeth n of the wheels j.

The pawl 0 thus forms, in principle, a toggle joint with eachone of the rounded teeth on each one of the wheelsj 9. Upon the rear end of the pawl o is a projection, q, which comes in contact with the adjusting-screw r at the extreme end of the upward stroke of the ham- [00 These two wheels are distant 8o mer. This adjusting-screw is so set as to trip the pawl 0 off of the rounded teeth a into the position shown in Fig. at at the instant that the drill is returned to contact with the rock at the bottom of the bore-hole by the leversf. As soon as the pawl o is tripped into the position shown in Fig. 4, the hammer falls and the pawl descends until it engages with the next succeeding teeth a, as shown in Fig. 1.

The fulcrum of the hammeuarm is at s.

tis a stirrup connecting the hammer with the main spring a. This stirrup is formed of two upright rods, one pivoted on each side of the helve and extending downward on either side of the sliding frame until they reach the end of the main spring, which rests upon a pin connecting their lower extremities. The opposite end of the main spring rests upon a cast lug on the sliding frame at o. This cast lug extends across from one side plate of the sliding frame to the other. The setscrew 10 works through a lug on the sliding frame and bears upon the top of the spring and gives it the requisite tension.

The operation is as follows: In Fig. 1 the hammer is shown as resting on the drill-holder. In Fig. 4 the parts are shown as when the hammer is raised ready to fall. Starting as in Fig. 1, a downward movement of the levers will cause the wheelsj to turn the distance between two of the pins Z. This will force the pawl 0 upward until it strikes the stop 9', when it will be thrown into the position shown in Fig. 4, and will cease to sustain the hammer.

In the meantime the hammer has been raised on the fulcrum s, ,the main spring has been compressed by the stirrup t, and the drill-has been turned by the pawls g g, and lifted and returned to the bottom of the bore-hole by the leversff, and, if necessary, the sliding frame has been fed forward. The hammer now delivers its blow, and the pawl 0 is returned to the position shown in Fig. 1, and the same operation is repeated when the handlevers are moved in the opposite direction. A spring, at, Fig. 1, may be employed, which forms contact with a stop on the han'lmer-arm, as indicated in Fig. 1, and thus serves to insure the engagement of the pawl 0 with the teeth a.

It will be observed that by having the parts ff,gg, and h 71/ all mounted on the same shaft between the rocking arms 0 c, and by having the two halves of the main shaft bearing those rocking arms and the sockets of the hamllevers combined by the same bolt D, it only requires the removal of the nutd for the purpose of taking apart all this portion of the ma chine, and though I do not limit myself to this feature it is one of great importance in consequence of its simplicity and cheapness;

It will also be observed that the hammer is in no way secured to the frame, but simply rests upon it at the point 8, it being held in position by the downward tendency of the main spring acting through the stirrup. Therefore, to remove the hammer from the machine, it is merely necessary to relax the tension of the main spring by loosening the set-scrcw w. This frees the lower end of the stirrup and consequently the hammer. The power obtained by the action of the pawl 0 and wheelsj, acting 011 the principle of the toggle-joint, is great, and the wearing-surfaces between the two may be hardened, and these two parts may be readily replaced by duplicates when worn. The spring a is of a suitable form to be rcad1ly made and varied in proportions as circumstances require, and to guard, so far as possible, against breakage. The sliding frame is light and strong and largely incloscs the operating parts. If any part of the machine should jam, so that the proper reciprocation or turning of the drill or the proper feed should be prevented, the action of all the pawls and levers h h, r r and ff would be instantly arrested and the blows of the hammer necessarily suspended until the difficulty was removed. Thus the damage which might result to the machine from a blow of the hammer when the other parts are not prepared is averted.

I have described what I understand to be the most desirable form of apparatus for embodying myinvention; but I do not limit myself to the form shown, and whenever a part is designated it is done for the purpose of bcing specific, and not with the intention of limitation to the form of the part or to exclude other arrangements within the scope of the invention.

I claim-- 1. The combination, with a drill-holder, of a hammer for actuating said drill-holder, a pawl connected with said hammer, and awheel actuated by the hand-lever through an intervening pawl and having projections which are adapted to form toggle-joints with said pawl, substantially as described.

2. The combination, with the drill-holder, of a hammer for actuating said drill-holder, a main spring adapted to actuate the hammer, the reciprocating hand-lever, a pawl c011- nected with the hammer and adapted to form a togglejoint with a piece actuated by the hand-lever, and a stop located in a position to trip said pawl when the hammer reaches the top of its stroke, substantially as described.

3. The combination, with the drill-holder, of a hammer for operating the drill-holder mounted upon a hammer-arm,with a pivot fulcrumpiece which rests in an open bearing on the sliding frame, a main spring adapted to actuate the hammer and hold the pivot of the hammer-arm in place in said open bearing, a set-screw whereby the tension 'of said main spring is regulated, and a hand-lever whereby said hammer is operated, substantially as described.

f. The combination, with a drill-holder, of a hammer for actuating said drill-holder, a pawl connected with said hammer, and a piece mounted in. the frame and adapted to form a toggle-joint with said pawl and actuated by the hand-lever, substantially as described.

IlC

5. Ihe combination, with a drill-holder, of a hammer for actuating said drill-holder, a pawl connected with said hammer, a piece mounted in the frame and adapted to form a toggle-joint with said pawl, and two pawls actuated by the hand-lever and alternately actuating said piece, substantially as described.

6. The sliding frame of a roclc'drill, composed of two side pieces, at one extremity of v which is located the barrel of the drill-holder,

and at the opposite extremity the fulcrum-of the hammer, in combination with the main spring supported at one end within the frame, and at the other end connecting with a stirrup depending from the hammer-arm on the outside of the frame, and said sliding frame being provided with the hand-lever shaft and the 7 The con'ibinatiomwith adrill-holder and a hammer for actuating the same, of a pawl adapted to raise said hammer and to form a toggle-joint with projections on a wheel, the said wheel provided with said projections and with pins adapted to be engaged by a pawl connected with the hand-lever, substantially as described.

8. 'Tlie combination, in a rock-drill machine, of a supportingframe, asliding frame bearing the operating parts, the shaft B made in two parts connected by the-dowel b, and provided with the pawl-actuatinglugs cc, and also provided in each endwith conical sockets, and the hand-levers having conical socket-pieces secured within said conical sockets by an adjustable bolt, D, substantially as described.

BROR F. BERGH.

Witnesses:

T. J. KEANE, D. H. DRISOOLL. 

